Portable electronic device with an animated graphical user interface



FIG. 1 is a front view of a first image in a sequence of a portable electronic device with an animated graphical user interface showing my new design;

FIG. 2 is a front view of a second image thereof; and,

FIG. 3 is a front view of a third image thereof.

The broken lines in FIGS. 1-3 of the portable electronic device with an animated graphical user interface are for the purpose of illustrating environment, and form no part of the claimed design. 

CLAIM The ornamental design for a portable electronic device with an animated graphical user interface, as shown and described. 